62 window frame TC62K 1.13kg/m62 window leaf TC62S 0.92kg/m62 middle style TC62ST 0.72kg/m62 centrally inserted piece TC62GM 0.36kg/m62 air shutter TC62FG 0.23kg/m62 glass holdfast 1 TC62DY 0.22kg/m62 glass holdfast 2 TC62SY 0.14kg/m